N

Mean

Std. deviation

t

df

Sig. (1-tailed)

Test value = 4

B. subtilis

32

2.3946

2.53981

−3.576

31

0.001

S. aureus

32

3.9768

4.21354

−0.031

31

0.975

Test value = 8

Klebsiella sp

31

1.9595

2.5984

−12.943

30

0.000

Salmonella sp

31

1.879

2.50943

−13.581

30

0.000

E. coli

32

2.17993

1.55635

−21.154

31

0.000